Blacklake, CA has a population of 895 and is the 15,836th largest city in the United States. The population density is 856 per sq mi which is 268% higher than the California average and 845% higher than the national average. The median age in Blacklake is 70 which is approximately 95% higher than the California average of 36. In Blacklake, 95% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 38% of Blacklake residents were born in California, 59% were born out of state, 0% were born outside of the United States and 3% were foreign born.